Trait redb::StorageBackend
source · pub trait StorageBackend:
'static
+ Debug
+ Send
+ Sync {
// Required methods
fn len(&self) -> Result<u64, Error>;
fn read(&self, offset: u64, len: usize) -> Result<Vec<u8>, Error>;
fn set_len(&self, len: u64) -> Result<(), Error>;
fn sync_data(&self, eventual: bool) -> Result<(), Error>;
fn write(&self, offset: u64, data: &[u8]) -> Result<(), Error>;
}
Expand description
Implements persistent storage for a database.
Required Methods§
sourcefn read(&self, offset: u64, len: usize) -> Result<Vec<u8>, Error>
fn read(&self, offset: u64, len: usize) -> Result<Vec<u8>, Error>
Reads the specified array of bytes from the storage.
If len
+ offset
exceeds the length of the storage an appropriate Error
should be returned or a panic may occur.
sourcefn set_len(&self, len: u64) -> Result<(), Error>
fn set_len(&self, len: u64) -> Result<(), Error>
Sets the length of the storage.
When extending the storage the new positions should be zero initialized.
sourcefn sync_data(&self, eventual: bool) -> Result<(), Error>
fn sync_data(&self, eventual: bool) -> Result<(), Error>
Syncs all buffered data with the persistent storage.
If eventual
is true, data may become persistent at some point after this call returns,
but the storage must gaurantee that a write barrier is inserted: i.e. all writes before this
call to sync_data()
will become persistent before any writes that occur after.